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drm/qxl: handle NULL bo->resource in move callback

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The ttm bo now initially has NULL bo->resource, and leaves the driver
the handle that. However it looks like we forgot to handle that for qxl.
It looks like this will just null-ptr-deref in qxl_bo_move(), if
bo->resource is NULL.

Fix this by calling move_null() if the new resource is TTM_PL_SYSTEM,
otherwise do the multi-hop sequence to ensure can safely call into
ttm_bo_move_memcpy(), since it might also need to clear the memory.
This should give the same behaviour as before.

Fixes: 1802537820 ("drm/ttm: stop allocating dummy resources during BO creation")
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230208145319.397235-2-matthew.auld@intel.com
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
This commit is contained in:
Matthew Auld 2023-02-08 14:53:17 +00:00 committed by Christian König
parent c604d31950
commit b129ff30ac
1 changed files with 11 additions and 0 deletions
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11
drivers/gpu/drm/qxl/qxl_ttm.c
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@ -143,6 +143,17 @@ static int qxl_bo_move(struct ttm_buffer_object *bo, bool evict,
struct ttm_resource *old_mem = bo->resource;
int ret;
if (!old_mem) {
if (new_mem->mem_type != TTM_PL_SYSTEM) {
hop->mem_type = TTM_PL_SYSTEM;
hop->flags = TTM_PL_FLAG_TEMPORARY;
return -EMULTIHOP;
}
ttm_bo_move_null(bo, new_mem);
return 0;
}
qxl_bo_move_notify(bo, new_mem);
ret = ttm_bo_wait_ctx(bo, ctx);